Induction-pipe for radial or rotary internal-combustion engines



A. H. R. FEDDEN AND L. F. G. BUTLER. INDUCTION PIPE FOR RADIAL 0R ROTARY INTERNAL COMBUSTION ENGINES.

Patented Nov. 1, 1921.

APPLICATION FILED NOV. 30, 1920.

wy- 1. G H n 6 I 7 y z/ 1 1s 11 theoutlet most remote from conduit.

mm orifice.

ALFRED nUEER'r RoY EEDDE1\T ARD LEONARD FREDE ICK GEORGE BUTLER, or

' V BRISTOL, ENGLAND, ASSIGNORS TO THE BRISTOL AEROPLANE COMPANY LIM- ITED, QF;BRIS' LOL, GLOUCESTER,ENGLAND.

mnUcrIoN-PrrEEoR-RAnIAL 0R ROTARY INTERNAL-COMBUSTION, ENGINES.

Specification of Letters Patent.

Patented N ov. 1, 1921.

Application filed November 30, 1920. Serial No. 427,385.

To all whom it may concern:

Be it known that we, ALFRED HUBERT Roy F DDEN and LEONARD, FREDERICK GEORGE BUTLER, both subjects of the King of England, and both residing at Bristol, in the county of Gloucester, England, have invented certain new and useful-Improvements in Induction-Pipes for Radial or Rotary Internal-Combustion Engines, of Which the following is a specification.

This inventionis for an improvement inor modification of the induction pipe system as described in the specification -'of Letters Patent No. 1,323,685 dated 2nd December, 1919, for use with multi-cylinder internalcombustion engines of the radial-or rotary type having a plurality of carbureters with a corresponding number of induction pipes, the arrangement being such that each in- .ductionjpipe or conduit is appropriated to and solely supplies a group of cylinders so placed apart angularly or so timed that the--induction periods of the various cylinders'inthe group do not overlap one another. Thevarious induction pipes or con-' duits are convenientlyconstituted by -an annular chamber having a core formed with spiral vanes to divide itinto the desired number of spiral conduits, or alternatively the induction pipes or conduits may be annular. I

' According tothis invention there is em-- ployed with each conduit of induction pipes as above-described, closure means situated between its inlet and one of its outlets nearest theretoso as to, permit flow from the inlet in one direction onlyv along, the

The closure form of a diaphragm inserted into or formed integrally with'the conduit and it is-preferably so shaped'as to con'formto therequired directionof' flow ofthe gases in the part of the conduit blocked by it. k

"In oneconstruction the closure means maybe constitutedby a bailie plate, one for each conduit, situated" immediately behind the inlet in the direction of flow of the gas, erabl'y so shaped as to direct the gas into that outlet. r e

In a modified form the closure means is constituted by-a deflector-plate, one for means may take the.

and is pref venient' manner.

each conduit, situated immediately to one side of the inlet pipe, thereby converting a T-connection of the inlet pipe with its conduit into an L connection. In a modified form of this construction, a small gap may be provided between the edge of the defiector-plate and the wall of the conduit, for. the purpose hereinafter described.

In theaccompanying drawings,

Figures land 2 are perspective views with parts broken away showing the application of bafiie plates adjacent an outlet pipe, to an induction pipe, having three spiral conduits "as described in the said specification of Letters Patent No.'1,323,685;

' Fig. 3 is a similar view native construction of baflle.

- Referring first to Figsl' and 2, the induction-pipe 10 is provided with a core 'ormed with three spiral vanes 11, 12, 13, which'divide it-into three spiral. conduits, whereof one is shown at 14 in Fig. 1 by the breaking away of a portion of the pipe 10. Each of' these conduits is supplied by a separate carbureter and supplies mixture to a group of cylinders, which as stated above,"are so timed, or'so spaced apart that their induction periods do not overlap. Communication is established between each of'the various cylinders and its conduit by a pipe 15 registering with a suitable opening in the wall of the induction pipe 10.

According toone embodiment of this invention, a defiector pla'te lfi is mounted in pipe 15." The baiile-plate 16 is conveniently constituted by apiece of sheet metal curved in, the manner justmentioned andiprovided with a flange 17 which: lies closely against the two vanes 11 thereto by screws '18" or in any other conshowing an alterand 12 and is secured Fig. 2 shows a back View of the baflie 16, shown in Fig. 1, and it will be seen that it is provided with two lugs 19, which serve as buttresses to support it, these lugs beingapproximately of a triangular" shape and seated along one edge on the vanes 11 and 12.

The direction of the flow of gases is indicated by the arrows a: and y in Fig. 1 and z in Fig. 2. q I

It will be observed that the part of the induction conduit between the back of the baflle 16 and the induction pipe'is not used and could be dispensed with. Further, it is to be understood thatthe baffleplate need not be formedas a separate part but it could be made integral with the core and vanes which are inserted in the pipe 10.

Referring now to Fig. 3, which illustrates a modified arrangement for the baiile-plate, the battle is in this case mounted beside the inlet openmg to each conduit in the induction pipe 10. In the construction illustrated thebaflle or deflector is constituted by a plate 30, which is so shaped as to close the'spiral conduit on one side of the inlet orifice thereto, and it is further so shaped as to provide an easy path of flow directing the gases which enter the pipe 10 at right-angles thereto into thespiral path which they are to follow around the plpe 10. The battle-plate 30 may, as before, he formed integrally with the vanes on the core of the induction pipe, or, as illustrated, it may be formed. integrally with a flange 31 which is secured to the induction pipe 10 around the inlet opening thereto. In this case the carbureter itself being bolted to the induction-pipe 10 holds the flange 31 in place.

In a modified construction of this invention a gap may be provided between the edge of the deflector-plate and the wall of the conduit, for example, by cutting away the part 32 of the plateto the dotted line 33. With this arrangement the dead end which exists at the back of the deflectoravoided, since the rush of gas into the conduit exertsan ejector effect on this gap and draws out. the gas which has accumulated behind the plate. It will be understood that there is an accumulation of gas. behind the plate owing to the inertia of the gases resulting from their constant flow around the induction pipe to the back of the plate.

1 It will further be understood that the deflector plates 30 }by providing a suitable curved path ior the flow of the gases facilitate their entry'into the spiral pipe. Without these deflector-plates the gas enters through the inlet and impinges on the opposite wall of thelspiral conduit almost at right-angles, thereby losing a considerable portion ofits velocity.

While this invention has been described as applied to an induction pipe having inlet and one of the nearest outlets of the conduit so as to permit flow from the inlet in one direction only along the conduit. 2. An induction pipe comprising in combination a plurality of endless conduits. spirally disposed about one another and each arranged to supply a group of cylinders whose firing periods are in sequence, means in each conduit situated between the inlet and one of the nearest oulets of the conduits so as to permit flow from the inlet in one direction only along the conduit and so shaped as to conform to the required direction of flow of the gas'in the part of the conduit blocked by it.-

3. An induction pipe comprising inco1nbination aplurality of endless conduits spi- 1 rally disposed about one another and each arranged to supply a group of cylinders whose firing periods are in sequence, a' diaphragm inserted in each conduit between the inlet and one of the nearest outlets ofthe conduits so as to permit flow from thevinlet in one direction onlyalong the conduit and so shaped as to conform to the required direction of flow of the gas in the part of the conduit blocked by it. 7 r c 4.. An induction pipe comprising in combination a plurality of endless conduitsspirally disposed about one another and each ar-. ranged to supply a group of cylinders whose firing periods are insequence, a formed integral with each of the conduits and situated between the inlet and one of the nearest outlets of the conduits so as to peralong the conduit and so shaped as to con-1 form to the required direction of flow of the gas in the part of the conduit blocked byit.

diaphragm 1 mit flow from the inlet in one direction only" 7 5. An induction ipev comprising in combination an annular chamber wherein is formed a plurality of endless conduits spirally disposed about one another and each.

as to conform to the required direction of.

flow of the gas in the part of the conduit blocked by i situated im- 6. An induction pipe comprising in combinationa plurality of endless conduits spirally disposed about one another and each arranged to supply a group of cylinders whose firing periods are in sequence, a diaphragm inserted in each conduit between the inlet and one of the nearest outlets of the conduits so as to permit flow from the inlet in one direction only along the conduit and so shaped as to conform to the required direction of flow of the gas in part of the conduit blocked by it, and of such size as to leave a small gap between it and the wall of the conduit so as to permit a continuous circulation of gases;

In testimony whereof we have signed our names to this specification in of two subscribing witnesses.

ALFRED HUBERT ROY FEDDEN. LEONARD FREDERICK GEORGE BUTLER.

l/Vitnesses:

J. STANLEY DANIEL, D. RICHARD SMITH.

the presence 15 

